"There is no tradition of joint poll campaign," PCC Vice President and media in-charge Prem Chand Mishra told reporters.
He dismissed suggestion of any "rift" in the tie-up for the 40 Lok Sabha seats in Bihar and said, "There should be no doubt about our alliance with the RJD due to this."
Rahul will hit the campaign trail in Bihar tomorrow with a rally at Aurangabad in favour of former Kerala Governor Nikhil Kumar.
"Both Congress and RJD have full understanding over the alliance and campaigning is being done under a special plan. The leaders will go wherever they are needed the most," Mishra explained.
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Prasad has already campaigned for Congress candidates in Aurangabad and Sasaram asking his supporters to vote for them, Mishra said.
The RJD chief had yesterday dodged a question as to whether he had been invited to rallies to be addressed by Sonia or Rahul. "Why are you asking questions that are confusing," he had said.
"We have requested them to address public rallies in all phases of elections here. Kishanganj, Purnia, Muzaffarpur, Samastipur and Supaul could be the possible places among others in this regard," Mishra said.
Meanwhile, the BPCC has requested the party central leadership to contest at least three out of the five Assembly bye-elections in Baisi, Chiraiya, Sahebpur Kamal, Kochadhaman and Maharajganj.